RTE_EXTMK ?= $(RTE_SRCDIR)/Makefile
export RTE_EXTMK
+# RTE_SDK_BIN must point to .config, include/ and lib/.
RTE_SDK_BIN := $(RTE_SDK)/$(RTE_TARGET)
+ifeq ($(wildcard $(RTE_SDK_BIN)/.config),)
+$(error Cannot find .config in $(RTE_SDK_BIN))
+endif
#
# Output files wil go in a separate directory: default output is